Feeder for steam-generators.



,No. 666,704.- Patented m. 29; 190:. L. SEBPOL-LET.

FEEDER FOB STEAM GENERATORS.

A nmi zi filed Dec. 28, 1899.)

(No Model.)

UNITED STATES PATENT GFFIQE.

LEON SERPOLLET, OF PARIS, FRANCE.

FEEDER FOR STEAM-GENERATORS.

SPECIFICATION forming part of Letters Patent No. 666,704, dated January 29, 1901.

Application filed December 28, 1899. Serial No. 741,868. (No model.)

To all whom it may concern:

Be it known that I, LEON SERPOLLET, a citizen of the Republic of France, residing at27 'Rue des Oloys, Paris, France, have invented Improvements in Feeders for Steam-Generators, of which the following is a specification.

One of the principal advantages of instantaneous steam-generators resides in their great range of power, which-is due to the readiness with which the generation of steam increases with an increase in the supply of water. When, however, the generator is heated by liquid fuel, it is necessary on increasing the supply of water to augment the heating power of the burner. Now the burner as soon as the normal conditions for which it was designed are departed from and it is forced gives 0% a considerable amount of smoke, which is a proof of incomplete combustion. Moreover, the burner heats and vaporizes only in an imperfect manner, and it becomes clogged up.

Now this invention has for its object to provide simpler and more certain means for giving instantaneous steam-generators the range of power mentioned, which enables them to get up steam quickly and to maintain a rapid generation of steam, while enabling the heating action of the petroleum or other liquidfuel burners to be increased as required without causing them to smoke and become choked up. Apparatus according thereto comprises a lever which is pivoted at one end and pulled by a spring toward its other end and to which various pumps are connected, the arrangements and working of which will be hereinafter described. To vary the strokes of these pumps, there is provided a stepped cam which works beneath the said lever in opposition to the pull of the spring, and by shifting which the amplitude of the oscillations of the lever can be varied. The return of the excess of feed-water to the tank is regulated by the combination of a receptacle under the pressure of the generator and a cylinder in which moves a piston acting on a by-pass valve acted onby a spring and by the pressure of the water forced from the feed-tank by two water-pumps. A third water-pump is intended more particularly to produce apart from and above the main steam-coils of the generator, by means of a delivery-pipe constituting a superheater, a certain quantity of steam,

which isinjected into the chimneyto increase the draft, so as to draw in a given time a greater volume of air around the nozzles of the burner in accordance with the increase of the supply of water.

Figure l of the accompanying drawings is a general longitudinal sectional view of steamgenerator apparatus according to this in vention. Fig. 2 is an end view of the apparatus as seen from the direction of the pumps. Fig. 3 is a plan showing the pumps. Fig. 4 is a sectional plan showing the aforesaid lever, the stepped cam,) which may be seen beneath the roller of the lever,) and another lever by means of which the said cam is moved when it is desired to alter the stroke of the various pumps.

On the shaft A, which receives its motion from the driving-shaft, is keyed a stepped cam B. The cylindrical portion of each step of this cam is at two diametrically opposite points flush with the cylindrical portion of the adjacent step, which enables each stepsurface to pass easily opposite to the roller.

0 is a narrow roller revolving around an axle 0, attached to the pump-leverD, which is oscillated about a pivot O at one end, while its other end is pulled by a spring R, which opposes the cam. The roller 0 when on any one of the steps of the cam B experiences no lateral action whatever, as is the case with conical cams. A water-pump a, a petroleum-pump b, and another small waterpump 0 are connected with the lever D by means of links. Another water-pump d can be operated by hand by means of a lever E when the engine supplied by the generator is at rest and it is desired to start it. The tank H supplies water through pipes f g i to the pumps a c d. The reservoir I supplies petroleum through the pipe j to the pump 5, which by means of the discharge-pipe 7c feeds the burner J, which is provided with as many Bunsen nozzles as may be required, while the water-pumps a and c deliver through the delivery-pipes Z m, respectively, to the bottom of the bundle of boiler-tubes and to an upper and serpentine pipe n, which constitutes a superheater in the upper part of the generator. The pipe it absorbs heat from the exhaust-gases and generates steam which is very hot and at high pressure. This steam escapes in a jet or jets into a conduitK, lead'' ing to the chimney and producing around the nozzle or nozzles of the burner J the increased flow of air necessary for the combustion of the increased supply of petroleum to the burner.

In order to prevent when the engine supplied by the generator is stopped the pressure of the Water in the generator from being greater than desired, there is provided on the steam-pipe T a branch 15, by means of which the issuing steam presses upon the surface of some oil contained in a receptacle L, which communicates, as shown, through a pipe 15' with the lower part of a cylinder M, in which moves a piston g, which is immersed in the oil and is pressed down by a' spring r, whose rod passes through a stuffing-box and can lift quently the valve itself, although the valve S is loaded both by a spring 7" and by the pressure of the Water forced into the pipe Z and the branch pipe Z. When the pressure of the steam leaving the boiler is great enough to lift the loaded piston q sufficiently by the intermediary of the oil in the receptacle L, the valve S is also lifted and the excess of water forced into the pipe Z passes the valve S and makes its way through a pipe 25 into the tank H.

The pumps a and b, the diameters of their pistons, and their points of attachment to the lever D, which regulates their respective strokes, being fixed have their respective capacities so proportioned that for any given volume of water delivered to the generator the burner will receive a determinate quantity of liquid fuel. Nevertheless, even if the proper proportion of the water and theliquid fuel be maintained the burner may possibly not be able sometimes to supply the necessary heat, owing to. an insuificient supply of air. Hence and to insure a more intense and more perfect combustion at the burner there has been added the pump 0, whose special function is to deliver water above the steampipe T in order that it may be transformed into steam, which costs practically nothing, and is injected into the chimney at a suitable point. This pump consequently enables the proportionate working of the pumps (1 and b to be effective.

What I claim is- 1. The combination with a steam-generator wherein the heating power is supplied by a liquid-fuel burner, ofa pump and connections for supplying liquid fuel to the burner, a

pump and connections for supplying water to the generator, means for driving the pumps,

' and means for simultaneously increasing or decreasing the amplitude of the piston-stroke of the pump to cause corresponding variations in the supply of fuel and water furnished to the generator.

.2. The combination with a steam-generator wherein the heating power is supplied by a liquid-fuel burner, of a pn mp and connections 'for supplying liquid fuel to the burner, a

pump and connections for supplying water to the generator, a lever to which the pistons of the pumps are connected, and whereby they are actuated, a stepped cam for operating the lever, and means for bringing a higher or lower step of said cam into operative relation with the lever to vary the movement of the lever and consequently the amplitude of the 1 strokes of the pistons and the quantity of wa- 1 ter and liquid fuel supplied to the generator. the rod of a balanced valve S, and consea liquid-fuel burner for generating heat, a -main steam coil ortube, and an auxiliary The combination with a steam-gen erator,

steam coil or tube discharging into the chimney-flue to increase the draft and intensify combustion,'of a pump and connections for supplying liquid fuel to the burner, a second pump and connections for supplying water to the main steam-coil, a third pump and connections for supplying water to the auxiliary steam-coil, means for driving the pumps, and

means for simultaneouslyincreasing or decreasing the amplitude of the strokes of the pistons of the pumps to cause corresponding variations in the supply of fuel and water to the generator.

4. In a generator of the kind described, a steam-generating coil, a water-tank, a pump connected with the tank and With the steam-- generating coil for supplying water to the latter, a'branch pipe or passage leading from the pipe connecting the pump to the steamgenerating coil back into the water-tank, a val'vein said branch pipe normally closing the same, means connected with the generatingcoil and adapted to be actuated by excess of pressure therein to open the valve in the branch water-pipe to return the excessive su pply of water to the water-tank, a liquid-fuel burner for heating the steam-coil, a pump and connections for supplying liquid fuel to said burner, means for driving the pistons of the water and liquid-fuel pumps, and means for simultaneously increasing or decreasing the amplitude of the strokes of the pistons to vary the supply of water and fuel.

Signed at Paris, France, this 17th day of November, 1899.

LEON SERPOLLET.

Witnesses:

EDWARD P. MAOLEAN, GEORGE E. LIGHT. 

